About our Storm Overflow Map
How to use our Storm Overflow Map and what it shows you.
Getting around the map
What the map is showing you
You can see what’s happening at each storm overflow. We have monitors on every one of our overflows, which at least once every 15 minutes tell us when – and for how long – each one has spilled.
Every spill is monitored by Natural Resources Wales who give us strict permits on how the overflows should be used.
Why overflows spill
If there’s been rainfall in the area recently, you might see more pink or purple markers. This is because overflows are designed to release extra rainwater from built-up areas and roads into watercourses.
Doing this means our homes and businesses are protected from flooding when the drains and sewers have too much water in them because of the rain.
What we're doing about overflows
Overflows are there for a reason, but we know people are worried about them. So we have a plan in place to reduce our impact on rivers, working with Natural Resources Wales to assess our storm overflows and target investment. Find out what we’re doing to Get River Positive.
Get in touch about our river plans
We know there might be something specific you want to hear about, or that you might even want to help.
Please get in touch if you have thoughts or suggestions.